Measurement of the flow of gas in conduits or pipes.



r ISI y H. M. EDMUNDS. MEASUREMENT 0F THE FLOW 0F GAS IN CONDUITS 0R PIPES.

APPLICATION FILED NOV. I3. 1913.

Patented Aug. 3,1915. I

STATES UFFICE,

'HOWARD ivi. .Enivi'unns or wn'sfriviinsrnn, ENGLAND.

MEASUREMENT OVE THE FLOW OF GAS 1N CONDUITS 0R PIPES.

Specification yof Letters Patent.

Patented Aiig'.3, i915.

Appiicatio'n fried November i3, i913. serial No. 800,782.

T0 all whom t may concern.'

Be it known that I, HOWARD MAURICE ED- MUNDs, a subject of the King of Great Britain and Ireland, residing at IVestniinstei'-, England, have invented new and useful Improvements in or in Connection with 'the Measurement of the Flow of Gras 'in 'Conduits or Pipes, of which the following is a specilication.

rIhis invention has vreference to the measurement of the flow of gas in conduits or pipes, and has for its object to provide a simple and efiicient measuring instrument whereby an indication of the rate of iiow of the gas may be obtained.

As in many known measuring instruments, the measuring instrument in accordance with this invention and as hereafter described, comprises or contains oney member or part that is, when the instrument is in use, .subject to two iniuences which are in opposition; the one iniuence is due to the action of the gas or other medium to be measured on the member or part and the other iniiuence to a controlling spring, weight or other force. -The alteration in value of one of the two influences acting on the member or part causes movement thereof and such movement is utilized, either directly or indirectly, to give an indication, the indication so given or made depending on the particular measurement desired.

Now in measuringinstruments of the type mentioned comprising the invention and for the purpose specied, the member or part mentioned is in the form of a circular disk or wheel, the periphery of which is lprovided 'with a plurality of blades or vanes. The disk or wheel is contained and is rotatably mounted within a casing, and such casing is inserted in the conduit orwpipe, the rate of flow of gas through which it is desired to ascertain. The disk or wheel, is, in accordance with this invention, so arranged that only the blades or vanes at one part of the periphery thereof extend transversely of or across the bore of the conduit or pipe. The gas as it flows along the conduitor pipe, acts on the bladesor vanes and it yhasa tendency to set the disk orkwheel. in rotation. This tendency or action of the stream or flow of gas is opposesd by a spring, weight or other force which isalso arranged to act on the disk or wheel. The controlling force just `mentioned is such that it tends to hold the disk or Awheel in one position, andto return it always to such position when moved thevanes or blades at one part of the pe riphery of the disk or wheel, pass or extend across the conduit or pipe, any lack of uniformity of flow will be automatically avoided and the average indicated.

The disk or wheel may carry a pointer, such pointer being movable in relation to a scale or dial suitably marked. The blades or vanes on the periphery of the disk or wheel are mounted and disposed thereon in any convenient manner and in suchwise that the planes of the faces of the blades or vanes are at an angle or inclined to the direction of the flow of the gas. Y

r At the part at which the blades or vanes pass across the bore 2of the conduit or pipe, the conduit or pipe is so constructed that the delivery of gas to, and exit from, the blades or vanes is effected without undue disturbing influences on the iiow of the gas being introduced. Preferably, to effect this, the ends of the conduit or pipe connecting with the casing, or parts thereof, will be slightly out of line.

One mode of carrying this invention into Vpractical effect is illustrated, more or less diagrammatically, on the accompanying sheet of drawings.

Figure l is a plan View and Fig. 2 is a ysectional elevation on the line A-A of Fig. l.

1 is the disk or wheel the periphery of which is provided with a plurality of blades or vanes 1S. The disk or wheel 1 is preferably so mounted as to rotate in a horizontal plane and is contained within a 'two-part' casing` 2, ,3 which is connected in the conduit or pipe line, the rate of flow of gas through which it is desired to ascertain.' 4: is the spindle carrying the disk or wheel l. The spindle 4 is carried in suitable bearings 5 secured to one or other of the parts 2, 3 of the casing. In the example illustrated, a rectangular framework 6 fits within the mouth of the part 2 of ythe casing and the bearings 5 are securedtosuch framework. The framework is secured to the part 2, as

byr means of screws 7..

riy

same initial position and temperature errors are compensated. The inner ends of the springsV are connected to the spindle 4C and their outer ends are connectedto projections 9 carried by the framework 6. The projecttions 9 maybe movable, in which case the zero of the instrument will be adjustable.

10 is a piece of cardboard, enameled porce lain, or the like on which are marked one or more scales. Two scales are illustrated in Fig. 1, one for low readings and the other for high readings. The scale board 10 is suitably supported in the part 3 of the easing and a window 11 is provided to enable the scales toy be seen. They scalesextend over 120o in theinstrument illustrated in the drawing and two pointers are provided subtending 120 atthe spindle. Y The pointer 12 is for the lower yscale and indicates low readings and the'pointer 13 is for the upper scale and indicates high readings. When the pointer 12passes oft' its scale, the pointer 13 commencesgto indicate on its scale. Of course, only one scale and one pointer may be provided if preferred or the instrument could be provided with more than two. The flow of gas Vacross the blades or vanes 18 is localized at one part of the periphery andforv this purpose a slot 14 is provided in both sides of the part 2 of the casing.

15 are boxesk secured to the casing above and below the slots 14. The inlet and outlet pipes 16 and 17.respectively, are con nected to the boxes 15, and the boxes 15 should, preferably, be large in comparison with the size of the slots 14 as this tends to give greater uniformity of flow across the blades or vanes. The slots 1li should, preferably, have the form of part of an annulus, but if the total length of the slot is short in comparison with the radius of the disk or wheel, they may be rectangular in shape.

vIt is important that the maximum difference 14 should be small in comparison with the effective radius of the disk or wheel. If, for example, the radial width of the slot exceeded one half ofthe extreme radius of the disk or wheel, irregularities of iiow in the slot would cause inaccuracies in the reading of the instrument.V In the arrangement C'opies of this patent may be obtained for ive cents each, by addressing the Y Gommissioner of Patents,

illustrated, there is a change in the direction of the iiow ofthe gas as it enters and leaves the casing but, as will be obvious,

such change ofv direction offlowmay be avoided by suitable disposition of the pipes 16,17. By the use of slots 14C as described, the flow` of gasacross the blades or vanes of the disk or wheel, is localized at one part of the periphery of the disk or wheel, and any lackof uniformity of iiow of the gas is automatically balanced and theaverage inp dicated. ,i j

The parts 2, 3 of the casing are secured together by screws 19 and the joint between these partsfis made gas-tight in any known manner.y

What I claim is y l 1. In yan instrument for measuring the vided with a series of vanes and angularly movable in Opposition to' a controlling'force by the gas the ow of which is to be measured, gas conducting means having an opening for the delivery of theY gas against the face ofk vsaid vanes, and gas conducting means'having an ropening arranged to receive the gas passing from said vanes and on the opposite side thereof from the first mentioned opening, bothsaid openings being of lesser width measured radially of said body than the radial width of the vanes and adjacent a part only of the periphery of said body, to localize the flow of gas across,

vsite sides of said vanes and so located relatively thereto that a portion only 'of said vanes extends transversely across said openings, whereby the passage of gas across said vanes is localized within a space measured radially of said vanes small as compared to that of the radial width of the vanes themselves, said opening being elongated circumferentially to cause the gas to impinge on more than one of said vanes simultaneously, but limited in length to confine the gas to a portion only of said body vmeasured circumferentially thereof.

Dated this 1st day of November, 1913. HOWARD'M. EDMUNDS. Witnesses:

TRACY LAY, HERBERT D. JAMESON.

Washington,1). C, ,l n Y .rate of the flow of gas, having a body pro- 

